Gas cylinder neck



FIG. 1 is a side view of a gas cylinder neck.

FIG. 2 is a side view of a gas cylinder neck.

FIG. 3 is a side view of a gas cylinder neck.

FIG. 4 is a side view of a gas cylinder neck.

FIG. 5 is a top view of a gas cylinder neck.

FIG. 6 is an isometric view of a gas cylinder neck; and,

FIG. 7 is an isometric view of a gas cylinder neck. 

CLAIM The ornamental design for a gas cylinder neck, as shown and described. 